Identification of sulfate species and their influence on SCR performance of Cu/CHA catalyst
An investigation into sulfate formation on Cu/CHA zeolites was conducted to confirm the main sulfate species that deactivate the catalyst. SO 2 -TPD and controlled regeneration of poisoned catalysts were carried out to study the physicochemical properties of the sulfates formed under different condi...
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| Published in | Catalysis science & technology Vol. 7; no. 7; pp. 1523 - 1528 |
|---|---|
| Main Authors | , , , , |
| Format | Journal Article |
| Language | English |
| Published |
2017
|
| Subjects | |
| Online Access | Get full text |
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| Abstract | An investigation into sulfate formation on Cu/CHA zeolites was conducted to confirm the main sulfate species that deactivate the catalyst. SO
2
-TPD and controlled regeneration of poisoned catalysts were carried out to study the physicochemical properties of the sulfates formed under different conditions. The results revealed that three sulfate species existed on the catalyst surface, namely H
2
SO
4
, CuSO
4
and Al
2
(SO
4
)
3
. H
2
O and NH
3
-SCR feed could improve the formation of H
2
SO
4
via
an increase in the reaction rate of SO
x
with protons and decrease the thermal stability of all sulfates
via
the protons' strong polarization effect. The poisoning effect of ammonium sulfate was more emphasized during sulfation in the presence of simulated exhaust gas. Additionally, in contrast to Cu/SSZ-13, Cu/SAPO-34 favored the formation of stable Al
2
(SO
4
)
3
species, which resulted in unrecoverable SCR activity in an inert atmosphere below 650 °C. |
|---|---|
| AbstractList | An investigation into sulfate formation on Cu/CHA zeolites was conducted to confirm the main sulfate species that deactivate the catalyst. SO
2
-TPD and controlled regeneration of poisoned catalysts were carried out to study the physicochemical properties of the sulfates formed under different conditions. The results revealed that three sulfate species existed on the catalyst surface, namely H
2
SO
4
, CuSO
4
and Al
2
(SO
4
)
3
. H
2
O and NH
3
-SCR feed could improve the formation of H
2
SO
4
via
an increase in the reaction rate of SO
x
with protons and decrease the thermal stability of all sulfates
via
the protons' strong polarization effect. The poisoning effect of ammonium sulfate was more emphasized during sulfation in the presence of simulated exhaust gas. Additionally, in contrast to Cu/SSZ-13, Cu/SAPO-34 favored the formation of stable Al
2
(SO
4
)
3
species, which resulted in unrecoverable SCR activity in an inert atmosphere below 650 °C. An investigation into sulfate formation on Cu/CHA zeolites was conducted to confirm the main sulfate species that deactivate the catalyst. SO2-TPD and controlled regeneration of poisoned catalysts were carried out to study the physicochemical properties of the sulfates formed under different conditions. The results revealed that three sulfate species existed on the catalyst surface, namely H2SO4, CuSO4 and Al2(SO4)3. H2O and NH3-SCR feed could improve the formation of H2SO4via an increase in the reaction rate of SOx with protons and decrease the thermal stability of all sulfates via the protons' strong polarization effect. The poisoning effect of ammonium sulfate was more emphasized during sulfation in the presence of simulated exhaust gas. Additionally, in contrast to Cu/SSZ-13, Cu/SAPO-34 favored the formation of stable Al2(SO4)3 species, which resulted in unrecoverable SCR activity in an inert atmosphere below 650 degree C. |
| Author | Li, Zhenguo Zhang, Yani Meng, Chenchen Su, Wenkang Li, Junhua |
| Author_xml | – sequence: 1 givenname: Wenkang surname: Su fullname: Su, Wenkang organization: State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China – sequence: 2 givenname: Zhenguo surname: Li fullname: Li, Zhenguo organization: State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China – sequence: 3 givenname: Yani surname: Zhang fullname: Zhang, Yani organization: State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China – sequence: 4 givenname: Chenchen surname: Meng fullname: Meng, Chenchen organization: Hebei Provincial Academy of Environmental Science, Shijiazhuang 050037, China – sequence: 5 givenname: Junhua orcidid: 0000-0001-7249-0529 surname: Li fullname: Li, Junhua organization: State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China |
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| Snippet | An investigation into sulfate formation on Cu/CHA zeolites was conducted to confirm the main sulfate species that deactivate the catalyst. SO
2
-TPD and... An investigation into sulfate formation on Cu/CHA zeolites was conducted to confirm the main sulfate species that deactivate the catalyst. SO2-TPD and... |
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| SubjectTerms | Catalysts Deactivation Exhaust Formations Simulation Sulfates Sulfation Zeolites |
| Title | Identification of sulfate species and their influence on SCR performance of Cu/CHA catalyst |
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